Question

15. One cell-thick vessels are called a) Arteries b) Veins c) Capillaries d) Pulmonary artery 16. The breakdown of pyruvate to give carbon dioxide. water and energy takes place in a) cytoplasm. b) mitochondria. c) chloroplast d) nucleus 17. In normal expiration, the diaphragm is a)Arehcd h) Flattened c) Perforated d) None of these 13. The correct pathway of blood in cin:uldlory SyStrm is a)atria —s ventricles —• arteries — veins h) ventricles —b. 3tri3 veins —..31/CriCS veins anent S atria d)vcins - > ventricles - > atria —. aneries

Answer 1

Answer:

15. Capillaries

16. Mitochondria

17. Arched

Answer 2

$\huge\mathbb\orange{Question}$

15. One cell-thick vessels are called

a) Arteries

b) Veins

c) Capillaries

d) Pulmonary artery

16. The breakdown of pyruvate to give carbon dioxide. water and energy takes place in

a) cytoplasm.

b) mitochondria.

c) chloroplast

d) nucleus

17. In normal expiration, the diaphragm is

a)Arehcd

b) Flattened

c) Perforated

d) None of these

13. The correct pathway of blood in cin:uldlory SyStem is

a)atria —s ventricles —• arteries — veins h) ventricles —

b. 3tri3 veins —..31/CriCS veins anent S atria

d)vcins - > ventricles - > atria —. aneries .

Explanation:

$\huge\mathbf\pink{Answer}$

$\large\underline\green{15 \: c \: - \: Capillaries \: . }$

Capillaries are the smallest vessels involved in the transportation od materials.

• These capillaries are too thin and small.

• Their walls are so light that they are made up of only one cell.

• The major function carried out by them is transportation and this transportation is carried out by diffusion.

$\large\underline\pink{16\: b \: - \: Mitochondria \: . }$

• It is at the mitochondria that the pyruvate breaks down to give carbon dioxide, water and energy.
• This process is called as pyruvate decarboxylation and is catalysed by pyruvate dehydrogenase.

$\large\underline\green{ Mitochondria \: is power \: house \: of \: cell \: . }$

$\large\underline\blue{17 \: c \: - \: arched \: . }$

• In normal expiration the diaphragm is arched.

• Inspiration is active process while expiration is a passive process.
• Inspiration is active process while expiration is a passive process. During inspiration, diaphragm is contracted to expand thoracic cavity.
• Enlarged diaphragm appears flattened during inspiration.

$\large\underline\purple{18 \: c \: - \: option \: . }$

• Deoxygenated blood is carried to lungs by the pulmonary artery where it is gets oxygenated and returns to left auricle through pulmonary vein.

Hence, in this way, the cycle starts again.

So, the correct answer is

'Left auricle →→ Left ventricle →→ Aorta →→ Arteries →→ Tissues →→ Veins →→ Right atrium'.

Hope it's helpful for you .